Weighing scale



April 4, 1944- M. A. WECKERLY WEIGHING SCALE Filed July 16, 1940 4Sheets-Sheet l Maw? 4. 14% a/rav" INVENTOR ATTOR N EVE) Ap 1944- M; A.WECKERLY 2,346,120

, WEIGHING SCALE Filed July 16, 1940 4 Sheets-Sheet 2 April 1944- M. A.WECKERLY 2,346,120

WEIGHING SCALE Filed July 16, 1940 4 Sheets-Sheet 5 Mark A. Weaker/yINVENTOR- ATTORNEYS ZZd/MMM Z April 4, 1944.

M. A. WECKE RLY WEIGHING SCALE Filed July '16, 1940 4 Sheets-Sheet 4JIM/A ,4. Weaker/y INVENTOR ATT ORNEYS Patented Apr. 4, 1944 WEIGHINGSCALE Mark A. Weckerly,

tion of New Jersey Toledo, Ohio, assignor to Toledo Scale Company,

Toledo, Ohio, a corpora- Application July is, 1940, Serial No. 345,78810 Claims. (01. 249-20) This invention relates generally to weighingscales, and more particularly to weighing scales adapted to determineautomatically and sequently loads of equal weight.

Scales of this type are used for a large variety of purposes, forexample, in continuous batching operations, charging continuouslyoperating furnaces, automatically weighing material as it passes from ahopper on one level to another hopper on a lower level and in fillingcontainers with loads of equal weight.

The principal object of this invention is the provision of improvedmeans for accurately determining loads of equal weight.

Another object is the provision of improved means for determining loadsof equal weight and discharging said loads at timed intervals.

Another object is the provision of improved means whereby the operationof load feeding means is inhibited until the previous load has beenentirely discharged.

These, and other objects and advantages will be apparent from thefollowing description in which reference is had to the accompanyingdrawings, illustrating a preferred embodiment of the invention and inwhich similar reference numerals refer to similar parts throughout theseveral views.

In the drawings:

Fig. I is a side elevational view of the device embodying the invention.

Fig. II is a fragmentary front elevational view thereof and showing thematerial feeding means.

Fig. III is an enlarged rear elevational view illustrating the loadcounterbalancing mechanism, load indicating means and control means ingreater detail.

Fig. IV is a still further enlarged fragmentary front elevational viewof a portion of the indicating means and control means.

Fig. V is a fragmentary sectional view substantially along the line V--Vof Fig. IV.

Fig. VI is an enlarged fragmentary side elevational view as seen fromalong the line VI--VI of Fig. I, illustrating in detail hopper controlmeans.

Fig. VII is a fragmentary view of one of the magnetic control switchessubstantially as seen from along the line VIIVII of Fig. IV andillustrating the relation to its actuating and adjusting means.

Fig. VIII is an enlarged fragmentary elevational view in section,showing indicator positioning means; and,

Fig. IX is a diagram of the electrical circuits.

. ing pendulums sector 36 which Referring to the drawings in detail:

The device as illustrated in Fig. I comprises a base I I in which ismounted, in the usual manner, aplatform lever system (not shown) andpivotally mounted upon this lever system is a platform l2. The free endof this lever system pivotally engages a rod l3 having a stirrup l4provided with a bearing l5 at its upper end with which it engages a loadpivot l6 extending laterally from the sides of a lever I! which, bymeans of a pivot I8, is fulcrumed upon suitable hearings in a bracket ISin the interior of an expanded portion of a column-like casing 20. Thiscasing is erected upon a deck-like portion of the base H immediately inback of the platform l2. The lever H, by means of a power pivot 2| whichis in spaced relation to the pivots able bearing in a stirrup 22 on thelower end of a connecting rod 23 whose upper end, by means of a suitablestirrup 24, engages a load pivot 25 in a pendulum actuating lever 26.This lever, by means of a pivot 21, is fulcrumed upon a suitable bearingin a bracket 28 in the interior of a substantially watchcase-shapedhousing 29 which surmounts the column-like casing 20.

A nose pivot 30, fixed in the free end of the lever 26, engages asuitable bearing in a stirrup 3| which, by means of a short rod 32, issuspended from an equalizer 33. Secured to faces of the equalizer 33 arethe lower ends of flexible metallic ribbons 34 whose upper ends overlieand are clamped as at 35 to the upper ends of power sectors 36 which areparts of load counterbalanc- 31. Each of these load counterbalancingpendulums, in addition to the power is mounted on a. shaft extendinghorizontally through its center of rotation, comprises a pair of fulcrumsectors 38, one of these sectors 38 being fixed to the aforementionedshaft on each side of the power sector. A pendulum body 39, also clampedon the shaft, extends downwardly and has studded in its lower end a stem40 upon which a pendulum weight 4| is adjustably seated and adapted tobe locked in adjusted position by means of a locknut 42.

Ribbons 43, whose upper ends are clamped as at 44 to a pendulum frame 45suitably positioned and fixed in the interior of the housing 29, havetheir lower ends secured to the lower ends of the faces of the fulcrumsectors thus serving to support the pendulums 31. Pivotally engaging theends of the shafts extending through the pendulums at their centers ofrotation is a frame 46 comprising a pair of so-called compensatingplates 41 and connecting yokes 46', one of these I 6 and I 3, engages asuit-- plates being stationed on each side of the pendulums. At a pointmidway between the points of pivotal attachment of the compensatingplates ll to the pendulums 37H tenons of a square shaft 68 are supportedin openings in these compensating plates (Fig. V) and to this squareshaft is fastened a resilient, substantially C-shaped member Q9. Themember 39 supports a rack foot 58 and a rack i, dependingly mountedtherein, engages a pinion 52 circumjacently fixed on an indicator shaft58. This indicator shaft is mounted in ball bearings E56 fixed inapertures in horizontally extending flanges E5 of the pendulum frame 55.A portion of this shaft 558, which ex= tends towards the front of thescale, has mounted thereon, by means of a suitable hub 56, an indicator5'41. Fixed to the shaft 58 on the opposite side of the pendulum frameit is a clutch plate 58 locked thereon by means of a set screw 59. Asecond clutch plate til is slidably mounted upon the shaft so that itmay frictionally engage the clutch plate 5t and secured to this clutchplate, by means of screws 6!, is a finger grip there being an indicator63 clamped between the two members he and as. This finger grip isprovided with a counterbore 36 (Fig. V) and extending partly into thiscounterbcre and pinned to the end of the shaft 53 is a button (55, acompression spring cs circumjacently mounted upon the shaft is seated inthe counterbore and its bias urges th clutch plates 58 and ed intogripping engagement. The finger grip 82 projects through an opening allin a sheet of glass 68 which encloses the rear of the housing 2%. Asimilar, but imperforate sheet of glass 6t? encloses the front of thishousing.

Fixed in the housing 29, immediately in back of the indicator El andcooperating therewith, is a chart it. This chart has printed thereon aseries of weight indicia it including a zero indicium 112. These indiciaare arranged in anticlockwise direction. A similar chart i3, bearingidentical indicia 76 having a zero indicium i5, is mounted directly inback of the indicator 63 on the rear side of the housing.

A plurality of control means, whose purpose will hereinafter be moreclearly described, are located in the housing 29, one of these beingsecured to the front of the pendulum frame 85 and one on its rear. Thecontrol means secured to the front of the pendulum frame 45 comprises astamped bracket '56 fastened by means of screws W to the verticallyextending struts of the frame (Figures 1y, VII). That portion extendingbetween the aforementioned struts is formed inwardly and slidinglyfastened thereto is a plate l8. This plate is provided with twoelongated slots it and two screws 86, which pass therethrough, arethreaded into properly spaced holes in the bracket I6. Helical springs8!, through which these screws pass, serve to hold the plate 18 againstthe bracket yet permit it to be adjusted laterally. Adjusting means forthis purpose comprise an ear 82 bent outwardly from the plate I8 intowhich an adjustment rod 83 is threaded. This rod extends laterally,penetrating the wall of the casing 29 and having a thumb knob 84 securedto that portion extending on the exterior of the housing.

' The adjustment rod 83, near its threaded end has a groove turnedtherein and this groove is positioned in an open-ended slot properlylocated in an car 85 extending outwardly from the bracket I6 andparallel to the ear 82. The shoulders formed by this slot prevent allbut rotative mosesame tion of the adjusting rod when turned by means ofthe thumb knob es.

Spring clips 86, which are riveted to the plate id, grippinsly engage amagnetic mercury switch 8?. Cooperating with the mercury magnetic switchill is a small permanent magnet 88 fastened, by means of a screw 39 andnut 93 to an ear 9i formed on the end-of an arm 92. This arm 92 is ofsuch length and riveted to the indicator in such position that when theindicator 5'5 is in registration with the zero indicium B2 on the chartE0 the permanent magnet 88 is so positioned as to influence the positionof the armature.

The control means secured to the rear of the pendulum frame comprises abracket 95?, a plat 96, a magnetic mercury switch 95 and a threadedadjustment rod Qt having a thumb knob 9? on the exterior of the housingas well as means, similar to those incorporated in the control meanssecured to the front of the pendulum frame 65, for retaining the plateand the mercury magnetic switch as well as the adjusting rod 9t.Similarly, an arm 9t? on the indicator 63 supports a small permanentmagnet 99.

To receive the material to be weighed out in equal hatches, a receptaclethe is provided. The receptacle in the present embodiment issubstantially rectangular in form with a cylindrical bottom. Preferablythe interior of this receptacle i smoothly finished to ofier noopporunity for the material to stick therein when the receptacle isemptied. The receptacle, however, must be constructed of such materialso that a hub mi, welded to one oi the walls of the receptacle 6%,rigidly supports this receptacle when mounted on the end of a shaft B92on which it is locked by means of set screws its. The shaft :02 is theoutput shaft of a speed reducing unit it which is adapted to reduce thespeed of a motor its mounted on the speed reducing unit. An end of anarmature shaft )6 of the motor is in operative engagement with a springset magnetic brake Hill. This brake is located within a housing which ismounted by means of brackets it on the casing of the motor M5. Theopposite end of the output shaft m2 of the speed reduction unit ltd hassecured to it a cam W9 which is adapted to n-. gage a roller H8 limitswitch ii2.' This limit switch is secured, by means of screws M3, to aformed bracket lid fastened by means of screws M5 to the platform i2.Its function enters into the operation of the scale which willhereinafter be described.

The material to be weighed is usually stored in a hopper H65 having aspout H? which opens into a funnel-like receiver lid on the end of avibratory trough H9. This trough is mounted I on spring plates 820 thatare secured to a base Hi.

Also mounted upon this base is a bracket H22 supporting an electromagnetI23 that acts on an armature 424 fastened to one of the spring plates528. This electromagnet and armature cooperate to form a reciprocatingelectromotor.

Since the vibratory trough H9 must deliver the material into thereceptacle Hill the base l2l, with the members mounted thereon, isgenerally secured to a frame I25 which extends upwardly above a portionof a frame I26 upon which the base I l is mounted. For the purpose ofkeeping a record of the number of weightments made, an electricallyactuated counting mechanism I2! is provided. In this embodiment thecounting mechanism i2! is mounted on a bracket I28 secured to the frameI25.

To receive-the load when the receptacle is mounted on an arm iii of asesame emptied there is stationed below the receptacle a funnel-liketerminal I29 01' a gravity conveyor which serves to deliver the materialwhen dumped from the receptacle to a desired location. v

Referring now to Figure III. For the purpose of counterbalancing theweight of the receptacle the motor and the gear reduction unit which aremounted on the platform I2, the end of the lever I] which projectsbeyond the column-like casing 26 has fastened to it a loading box I36and to the opposite end of this lever is pivotally secured the plunger01' a dashpot I3I which serves to dampen the vibration of the device.

Since the position of the indicator 63 is adjustable relative to theposition oi. the indicator 51, through the clutch members 58 and 66, itis necessary that the indicator 51 is held in registration with its zeroindicium 12 when such adjustment is being made. To accomplish this, anindex arm I32 is fastened to the hub 56 of this indicator in suchposition that a V notch I33 is adapted to receive a chisel pointed endI34 of a positioning plunger I35. The inner end of this plunger (FiguresIV andVIII) is guided by a small formed bracket I36 secured, by means ofa screw I31, to the pendulum frame 45. The other end of this plunger ismounted in a hole of the housing 29 through which it projects, therebeing a button I38 pinned to the protruding end. By applying pressure tothe button I38 the chisel pointed end I34 enters the notch I33 in themember I32 and holds the indicator 51 against rotation. To assure thatafter the positioning operation of the indicator 63 the plunger I35releases and frees the positioning member I32, there is provided a smallformed bracket I39 secured, by means of screws I49, to an interiorlypositioned flange in the housing 29. The plunger I 35 also passesthrough an opening in this bracket and a helical spring I43, which iscircumjacently mounted on thi plunger and positioned between the bracketI39 and a collar I4I pinned on the plunger I35, urges the plunger out ofengagement with the member I32 until a collar I42 pinned on the plungerI35 on the opposite side of the bracket I39 engages this bracket andprevents further movement, means (not shown) bein provided to preventthe plunger I35 from rotating about its longitudinal axis so that thechisel pointed end I34 is always in proper alignment with the notch I33in th member I32.

As previously stated, the small permanent magnets 88 and 99 must be,when the indicators 51 and 63 respectively are in registration withtheir zero indicia, in such positions relative to the magnetic mercuryswitches 81 and 95 that the normally open contacts are closed by drawingtheir armatures I45 and I46 respectively into engagement with theglobules of mercury I41 and I48 in the bottoms of their exhausted glasscapsules. If this is not the case the operator must, by turning thethumb knobs 84 and 91, adjust the plates 18 and 94 until this conditionis obtained.

It, for example, it is desired to determine batches of material weighing32 pounds each and deliver them exactly one minute apart the operator ofthe device applies pressure on the button I38 on the plunger I35 whenthere is no load in the receptacle I06 and the indicator 51 registerswith its zero indicium 12. The chisel pointed end of this plunger nowenters the notch I33 in the member I32 and holds the hand 51 inregistration with the zero indicium 12. The

operator, by placing the thumb of his other hand 7.1

I 32, then disengages on the button 34 and by exerting a pulling forcewith his index and first fingers on the finger grip the clutch plate 66secured thereon from the clutch plate 58 and turns the finger grip 62until the indicator 33 registers with that indicium on the chartrepresenting 32 pounds. He then carefully releases the finger grip 52and the cooperating spring 64 causes the faces of the clutch plates 56and\66to again frictionally engage each other, thus eiiectivelyconditioning the scale to determine loads weighing 32 pounds each. If,ashereinbei'ore stated, it is required that a batch of material bedelivered each minute the operator now adjusts an electrical timingdevice I44 (Fig. IX) which is in the electric control circuit to cause acontact to be made in one minute intervals. Since such eIec-- tricaltiming devices are well known the one employed is not described ingreater detail.

The operator now closes a normally open start switch I50 and currentflows from one side of the source I5I through a. lead I52, the switchI56, a normally closed stop switch I53 to the coil of a relay I54 andthen through leads I55, I56 and I51 to the other side of the source.This energizes the coil of the relay I54 and closes its normallyopencontact I58. Current now flows from one side of the source throughthe lead I52, contact I58, lead I59, the normally closed stop switch I53, the coil of the relay I54, leads I55, I56, I51 to the other side orthe source. Thi is a holding circuit and maintains the coil of the relayI54 energized when pressure is released from the normally open startswitch. When this holding circuit is energized a synchronous motor ofthe timing device I44, which is connected in parallel with the holdingcircuit, is also ener gized and this starts to rotate. When the normallyopen contact I58 of the relay I54 is closed current flows through thelead I52, the contact I 58, leads I59 and I60, normally closed contactI6I of a mechanical interlock relay I62, through leads I63, I64 and coilof a relay I61, leads I68. I55, I56, I51 to the other side of thesource. This energizes therelay I61. The energization of the relay I61closes its normall open contacts I69 and I10 and current now flowsthrough leads "I and I12 which energize the electromagnet I23 which,with the armature I24, comprises a reciprocating motor. The actuation ofthis motor imparts a series of vibratory impulse to the trough H9 andmaterial in the hopper I I6 is fed through the spout II1 to thevibratory trough II9 which feeds the material into the receptacle I00which is positioned upon the platform I2 of the weighing device. As thematerial is accumulating in this receptacle the moment occasioned by thegradually increasing load is transmitted through the platform leversystem (not shown) of the device, the connecting rod I3, lever I1,connecting rod 23, lever 26 through the equalizer 33 and the flexiblemetallic ribbons 34 to the pendulums 31. These, in the manner wellknown, move upwardly on their suspensions and their centers of massoutwardly and upwardly, thus their increasing moments counterbalanc theload.

The rack 5I, which partakes of the upward movement of the pendulums 31,rotates the pinion 52 with which it meshes and the indicator 51 rotatesin an anticlockwise direction and the in dicator 63 in a clockwisedirection, as seen in Figures IV and III respectively, until theindicator 63 comes into registration with the zero indicium 15 of theseries 14. In this position the magnet 39, secured on the arm 98 of theindicator 6t, influences the armature 868 or the magnetic mercury switch05 causing it to engage a mercury globule i 50 thus closing a circuitfrom one side of the source through the lead 652, the contact ltd,the'leads H59 and Mid, the contact 56 l the leads M33 and 868, themercury switch at, the lead from the armature or the switch 95 to thecoil of the relay itt, such coil and the leads the, i156 and it? to theopposite side of the source MI. The closing of this circuit energizesthe coil of the mechanical interlock relay 5G2 and opens its normallyclosed contact lti breaking the circuit which energizes the coil of therelay it'd thus permitting the normally open contacts its and M to openand de energize the electromagnet 928 or the reciprocating motor thusstopping the now of material to the receptacle 300. When thiselectromagnet is energized by the closing of the contacts its and ililcurrent also flows through leads Hi3 and lid to a solenoid coil N of thecounting mechanism 927 actuating its armature ilt and through an armill, pivotally engaged by the armature lid, operates the countingmechanism thus registering each time the reciprocating motor of thefeeding device is energized. The breaking oi the motor feed circuitpermits the armature lid to drop, conditioning the counting device forthe next load.

The energization of the coil of the mechanical interlock relay E62closes its normally open contact i718 and permits a latch M0 to lock anarmature arc of this relay in its closed position. The opening of thecontact Itl of the mechanical interlock relay de-energizes the coil ofthe relay but the contact W8 thereof remains closed because the armatureWe is latched against its magnet by the latch 5'89. Closing of thisnormally open contact I75 permits current to flow from one side of thesource through leads 557?, 556, 955, Mi, coil of relay lat, lead 982,the contact its, leads B83 and 60d to a normally open contact I85 of thetiming device M4. Closure of this contact by the timing mechanism M41completes the circuit through the lead E59, contact I58 and lead I52 tothe other side of the source, thus energizing the relay I85. When thisrelay is energized the normally open contacts 88?, I88 and I99 areclosed. Closure of the contact I90 inserts a hold-in circult for therelay E80 into the circuit just described from the contact H8 throughthe lead I03,

a lead 200, the contact I99, a lead I98, the lead I60 and the lead I59to the contact l50. Therefore, the almost immediat reopening of thetimer contact I05 does not de-energize the relay B85. Current then flowsthrough the leads I52, I89, the contact I88, lead I9@ and the windingsof the motor I05 and through a lead I9I the now closed normally opencontact i81,leads I0l, I55, I56, I51 to the other side of the line. Whenthis circuit is made, current also fiows through leads I93 and I94energizing a coil I95 of the brake I0! which is mounted on the motorI05. Energization of this coil raises a brake shoe I96 which operativelyengages the armature of the motor I05, allowing this motor to freelyrotate.

Since the motor I05 is directly coupled to the speed reduction unit I04and the receptacle I00 is mounted on the output shaft of this speedreduction unit, the receptacle I00 rotates slowly discharging thematerial therein into the funnel-like terminal I29 when the receptacleassumes a position which permits the material to flow out. Thereceptacle however continues to rotate making a complete revolution,that is, until the cam I09, also mounted on the output end of the speedreduction unit shaft, engages the roller H0 on the aaeaiac arm. ill orthe limit switch M2 closing the normally open contact it? of this limitswitch.

As the material flows from the receptacle ltd the pendulums 371 areoverbalanced and they reto their initial position causing the indicatorto again register with its zero indicium and the indicator til to againregister with the 32 pound indicium on its cooperating chart. The magnet38 on the indicator til now draws the ar-' mature M6 or the magneticmercury switch 5i into contact with the glohule oi mercury i l'i closinga circuit. Gurrent flows from one side of the current source throughleads i152, contact 858, leads 859 and it, lead M33, th now closednormally open contact 899 of relay I 86, leads tilt, 983, the armatureM5, the globule of mercury t lt and through lead 205 to a magnet 2&2which forms a part of the mechanical interlock relay G62 and thenthrough leads 203, 2%, the now closed normally open contact it? or thelimit switch M2 and through leads 28F: and it to the other side of theline thus energizing the magnet Eat and.

withdrawing the latch I118, permitting contact iii of the relay I62 toopen and its contact let to close. The opening of the contact H3de-energizes the relay its permitting the contacts i8? and R98 to openthus de-energizing the motor its and de-energizing the coil i permittingthe brake shoe B96 to operatively engage the armature of the motor i055and stopping its rotation. When the contact lti is closed, the circuitenergizes the electromagnet H23 of the vibratory feeding trough andmaterial again flows into the receptacle, beginning another cycle ofoperation since the holding circuit in which the relay ltd is positionedis not de-energized until this circuit is broken by pressure upon thestop switch I53.

It will be seen that if material remains in the receptacle after beingrotated the indicator 5? will not return to its zero position and thecircuit energizing the motor i 05 will not be broken since the magnet 88under those conditions will not draw in the armature I55 of the magneticmercury switch 811 and the motor will continue to rotate the receptacleuntil all the material has been discharged.

Having described the invention, I claim:

1. In a device of the class described, in combination, weighingmechanism, a material supply hopper, load receiving means operativelyconnected to said weighing mechanism comprising a rotatable receptacle,an electric motor operatively .connected to said receptacle, means forconveying material from said supply hopper to said load receiving means,electric means for actuating said conveying means, load indicating meansand load determining means comprising a pair of stationary chartsbearing weight indicia, a pair of pivotally mounted indicators, meansactuated by said weighing mechanism for rotating said indicators inresponse to material in said load receiving means, one of saidindicators being adapted to be manually positioned relatively to itscooperating chart to such indicium on said chart indicative of theweight of such material to be determined, the other of said indicatorsbeing adapted to continuously indicate the weight of such material insaid receptacle, a switch positioned adjacent the path of movement ofeach of said indicators, means on each of said indicators for actuatingits cooperating switch, electrical means extending between saidindicator actuated switches and said electric means for actuating saidmaterial conveying means and between said switches and said motoroperatively connected to said receptacle, whereby the action or saidfeeding means is interrupted when said manually positioned indicatorsenses the presence of the desired amount or such material in saidreceptacle and said motor operatively connected to said receptacle isenergized to rotate said receptacle to discharge such material, meansfor stopping the rotation of said receptacle and means for automaticallyre-energizing said electric means for actuating said material feedingmeans for another cycle of operation.

2. In a device of the class described, in combination, weighingmechanism, a material supply hopper, load receiving means operativelyconnected to said weighing mechanism and comprising a rotatablereceptacle, an electric motor operatively connected to said rotatablereceptacle, electrically actuated means for conveying material from saidsupply hopper to said load receiving means, load indicating meanscomprising a stationary indicia bearing chart and an indicator actuatedby said weighing mechanism for indicating the weight of such material insaid. receptacle, a second stationary indicia bearing chart and an,indicator adapted to be manually set to such indicium on said chartindicative of the weight of the desired load, a magnet on each of saidindicators and a magnetic mercury switch positioned adjacent the path ofeach of said indicators and electrically connected to said materialconveying means and to said motor operatively connected to saidrotatable receptacle, that magnetic mercury switch positioned adjacentthe path of said manually set indicator being adapted to stop theoperation of said material conveying means when the desired weight ofmaterial has been deposited in said rotatable receptacle and to energizethe motor operatively connected to said receptacle to rotate saidreceptacle and discharge such material, the other of said magneticmercury switches being adapted to prevent de-energization of said motoroperatively connected to said rotatable receptacle until all material insaid hopper has been discharged.

3. In a device of the class described, in combination, weighingmechanism comprising a load supporting lever system, loadcounter-balancing means operatively connected to said load supportinglever system, load indicating means actuated by said loadcounterbalanclng mechanism, a receptacle rotatably supported by saidload supporting lever system, a motor for rotating said receptacle, amaterial supply hopper and electrically actuated means for conveyingmaterial from said material supply hopper to said receptacle on saidload supporting lever system, said load indicating means including ashaft, an indicator fixedly mounted on said shaft, and an indicatoradjustably mounted upon said shaft, magnets secured to said indicators,a pair of magnetic mercury switches, means for adiustably mounting saidmagnetic mercury switches adjacent paths described by said magnets onsaid indicators, and electrical connections between said magneticmercury switches, said electrical conveying means and said motor forrotating said receptacle on said load supporting lever system, wherebythe conveyance of such material is interruptedwhen a predeterminedquantity has been conveyed into said receptacle on said lever system andwhereby such material is subsequently discharged from said receptacle byrotation of said receptacle by said motor.

4. In a device of the class described, in combination, weighingmechanism comprising a load means operatively connected to said loadsupporting lever system, load indicating means actuated by said loadcounterbalancing mechanism, a rotatable receptacle supported by saidload supporting lever system, a motor operatively connected to saidrotatable receptacle, a material supply hopper and electrically actuatedmeans for conveying material from said material supply hopper to saidrotatable receptacle, said load indicating means including a shaft, anindicator fixedly mounted on said shaft, and an indicator adjustablymounted upon said shaft, magnets secured to said indicators, a pair ofmagnetic mercury switches, means for adjustably mounting said magneticmercury switches adjacent paths described by said magnets on saidindicators, and electrical connections between said magnetic mercuryswitches, said electrical conveying means and said motor operativelyconnected to said rotatable receptacle on said load supporting leversystem, whereby the conveyance of such material is interrupted when apredetermined quantity has been conveyed into said rotatable receptacleon said lever system and whereby such material is subsequentlydischarged from said rotatable receptacle.

5. In a device of the class described, in combination, weighing means,weight indicating and load controlling means controlled by said weighingmeans, mercury magnetic switches actuated by said weight indicating andload controlling means, a rotatable receptacle mounted upon saidweighing means, means for feeding material into said rotatablereceptacle, means controlled by said load controlling means adapted tointerrupt the feeding of such material when a predetermined amountthereof has been deposited in said receptacle, a motor operativelyconnected to said receptacle, means controlled by said controlling meansfor energizing said motor to rotate said receptacle to discharge suchmaterial from said receptacle, 8. switch controlled by said motor forinterrupting the action of said motor when said motor has rotated saidreceptacl through an angle of substantially 360 and means controlled bysaid load indicating means for preventing such interruption of saidmotor until all such material in said receptacle has been dischargedsaid means controlled by the load indicating means further comprisingmeans for automatically're-energizing said material feeding means whenall such material in said receptacle has been discharged.

6. In a device of the class described, in combination, weighing means,weight indicating and load controlling means controlled by said weighingmeans, mercury magnetic switches actuated by said Weight indicating andload controlling means, a rotatable receptacle mounted upon saidweighing means, means for feeding material into said rotatablereceptacle, means controlled by said load controlling means adapted tointerrupt the feeding of such material when a predetermined amountthereof has been deposited in said receptacle, a motor operativelyconnected to said receptacle, means controlled by said controlling meansfor energizing said motor to rotate said receptacle to discharge suchmaterial from said receptacle, a switch controlled by said motor forsupporting lever system, load counterbalancing interrupting the actionof said motor when said motor has rotated said receptacle through anangle of substantially 360 and means controlled by said load indicatingmeans for preventing such interruption of said motor until all suchmaterial in said receptacle has been discharged.

7. In a device of the class described, in combination, weighing meanscomprising load supporting means, load counterbalancing means operatively connected to said load supporting means, load indicating meansactuated by said load counterbalancing means and load determining meansactuated by said load counterbalancing means, electrically controlledmaterial feeding means, loadreceiving means cooperating with saidweighing means, said load receiving means comprising a' rotatablymounted receptacle, electrically controlled means for rotating saidrecep-= tacle, and electrical means including electrical switchesactuated by said load indicating and load determining means connectingsaid load feeding means to said load determining means, and connectingsaid load determining means to said receptacle rotating means andconnecting said load indicating means to said receptacle rotating meansfor controlling said receptacle ro tating means.

8. In a device of the class described, in com bination, weighingmechanism including load counterbalancing mechanism, material feedingmeans, a material receiving receptacle mounted on said Weighing means,weight indicating means operated by said load counter-balancingmechanism, weight determining means operated by said loadcountcrbalancing mechanism, means for emptying material from saidreceptacle, electrical means controlled by said weight determining meansfor stopping operation of said material feeding means and forinstigating operation oi,

said means for emptying material from said receptacle and otherelectrical means controlled by said indicating means for stoppingoperation of said means for emptying material from said receptacle andfor instigating operation of said ma= terial feeding means.

9. In a device of the class described, in comaaae, 12o

bination, weighing mechanism including load counterbalanclng mechanism,material ieeding means, a material receiving receptacle supported bysaid weighing means, weight indicating means operated by said loadcounterbalancing mechanism, manually pre-settable load determining meansoperated by saidload counterbalancing mechanism, means for emptying saidreceptacle, electrical means controlled by said load determining meansfor stopping operation of said material feeding means and forinstigating operation of said means for emptying said receptacle attimed intervals and other electrical means controlled by saidindicatingmeans for stopping operation of said means for emptying said receptacleand for instigating operation of said material feeding means only uponthe complete emptying of said receptacle.

10. In a device of the class described, in combination, weighing meanscomprising load supporting means, load counterbalancing meansoperatively connected to said load supporting means, load indicatingmeans actuated by said lead counterbalancing means and load determiningmeans actuated by said load counterbalancing means, electrical switchesactuated by said load indicating and said load determining means,material feeding means, load receiving means supported by said loadsupporting means, said load receiving means comprising a rotatablymounted receptacle, electrically controlled means for rotating saidreceptacle in response to signals from said load indicating and saidload determining means, and electrical connections between said loadfeeding means and said electrical switches and between said electricalswitches and said receptacle rotating means.

MARK A. WECKERLY.

